Switzerland and Luxembourg are planning to join the Beijing-backed development bank AIIB, China's finance ministry said, the latest European nations to sign up to the multilateral lender which has drawn skepticism from the United States.

Britain, France, Germany and Italy have already announced their intentions to join the Asian Infrastructure Investment Bank -- which is viewed by some as a competitor to the World Bank and the Manila-based Asian Development Bank.

Switzerland will return to Nigeria some $380 million (360 million euros) linked to ex-dictator Sani Abacha, Geneva's public prosecutor said Tuesday, adding that it was closing a 16-year case on the funds.

Abacha ruled oil-rich Nigeria with an iron fist from 1993 until he died in 1998. The economy grew under his rule, though he was seen as extremely corrupt and faced criticism over his human rights abuses in the oil-rich nation.

A Swiss man of Syrian Christian origin who battled the Islamic State group faces charges after returning home, raising the issue of how Europe handles citizens fighting IS.

European governments already face the headache of dealing with citizens who have gone to Syria to join the ultra-violent Islamist IS group. But volunteers in units fighting against IS pose a new problem.

Poland on Tuesday criticized a Swiss company's sale of high-tech camouflage netting to Russia despite Western sanctions over its role in the Ukraine conflict.

"It must be condemned... supplying this kind of equipment facilitates the aggression of the Russian military," Foreign Minister Grzegorz Schetyna told PAP news agency of the 85 million euros ($91 million sale).

Top diplomats from Iran and the U.S. began a new round of marathon talks on a nuclear deal late Monday, as Israeli leader Benjamin Netanyahu warned the emerging accord could threaten his country's survival.

U.S. Secretary of State John Kerry and Iranian Foreign Minister Mohammad Javad Zarif met in a Swiss lakeside hotel for a series of sessions which are scheduled to stretch into Wednesday afternoon.